Two cycle engine having minimal lubrication

Abstract

The invention relates to a two cycle engine comprising a lean lubrication system, whereby the lubrication oil is only applied in the area of a contact surface between a piston and a cylinder. An oil outlet is provided in or below a running surface pertaining to the cylinder for this purpose. An oil aerosol can be applied alternately, according to the position of the piston, onto the running surface of a shaft pertaining to the piston and onto the running surface of the cylinder via said oil outlet.

1. Use of a two cycle engine having at least one cylinder and a piston which can move in the cylinder, wherein
 oil is discharged exclusively in the form of an oil aerosol, in the region of a contact surface between the piston and the cylinder, onto a running surface of a piston skirt of the piston and onto a running surface of the cylinder;  
 in or below the running surface of the cylinder, there is provided an oil outlet which is coupled to a conveying device and through which the oil aerosol is discharged onto the running surface of the piston skirt and onto the running surface of the cylinder, wherein  
 the oil aerosol is discharged from the oil outlet alternately 1) onto the running surface of the piston skirt when the piston is located in the proximity of a lower dead center thereof, and 2) onto the running surface of the cylinder when the piston is in the proximity of an upper dead center thereof; wherein  
 the quantity of the oil supplied is such that oil is minimized from exiting into a combustion chamber or into a crank chamber located below the piston; wherein  
 the piston is coupled to a crank shaft via a connecting rod and a connecting rod bearing; wherein  
 the connecting rod bearing has life-time lubrication or has a material pairing requiring no additional lubrication,  
 
     wherein the tool has a movement-conversion device disposed in a housing for conversion of a rotary movement produced by the two cycle engine into a working movement; 
     and wherein
 the two cycle engine is disposed on or in the housing;  
 the housing is supplied with oil for the purpose of lubricating the movement-conversion device; and  
 the two cycle engine is lubricated by the provision of the oil from the housing to the oil outlet.  
 
   
   
     2. The use as claimed in  claim 1 , wherein the two cycle engine is lubricated exclusively by the oil from the housing. 
   
   
     3. The use as claimed in  claim 1 , wherein the conveying device serves to convey oil from the housing to the two cycle engine. 
   
   
     4. The use as claimed in  claim 1 , wherein the oil is an oil aerosol which is produced in the housing by the movement-conversion device. 
   
   
     5. A tool comprising:
 an engine operable using oil lubrication for at least one cylinder and a piston so as to produce a rotary movement, the piston operable to move in the cylinder, the at least one cylinder having a running surface, the piston including a piston skirt having a running surface, the piston movable between a proximity of a lower dead center position and a proximity of an upper dead center position;  
 oil supply means for supplying a lubricant oil aerosol;  
 an oil outlet, located in a region of a contact surface between the piston and the at least one cylinder, that discharges an oil aerosol onto the running surface of the piston skirt and onto the running surface of the at least one cylinder;  
 conveying means, for conveying oil from the oil supply means to the oil outlet such that the oil aerosol is discharged onto the running surface of the piston skirt and the running surface of the at least one cylinder,  
 movement-conversion means, disposed in a housing, for conversion of a rotary movement produced by the two cycle engine into a working movement,  
 
     wherein the oil aerosol is discharged from the oil outlet alternately onto the running surface of the piston skirt when the piston is located in the proximity of the lower dead center position, or is discharged onto the running surface of the at least one cylinder when the piston is in the proximity of the upper dead center position, 
     wherein the quantity of the oil aerosol supplied is such that the oil aerosol is minimized from exiting into a combustion chamber or into a crank chamber located below the piston, 
     wherein the two cycle engine is disposed on or in a housing, wherein the housing is supplied with oil for the purpose of lubricating the movement-conversion means, and wherein the two cycle engine is lubricated by the provision of the oil from the housing to the oil outlet.